星系形成演化模型中的冷气体成分

Cold gas in the models of galaxy formation and evolution

星际介质中的冷气体是星系的重要组成成分,主要由分子气体H_2和原子气体HI两种成分组成,它们参与了星系形成和演化的各种物理过程,是形成恒星的原材料.目前基于星系形成和演化模型来研究分子气体和原子气体主要使用半解析模型和流体动力学模拟两种方法,两种方法都存在各自的优势和不足.本文主要介绍了近年来这方面模型工作所取得的进展,并介绍了模型所给出的一些最新结果和预言.这些结果能很好地符合和解释已有的H_2和HI气体的各种观测,并可以为今后ALMA,ASKAP,SKA,FAST等大型射电设备对HI和CO气体的观测做理论模型预言和巡天观测指导.

Cold gas in interstellar medium is a very important component in galaxies, which mainly includes molecular gas H2 and atomic gas HI. They play significant roles in galaxy formation and evolution, and offer reservoirs for star formation. To study molecular gas and atomic gas based on the galaxy formation models, two kinds of methods are usually used. They are the semi-analytic model and the hydrodynamic simulation. Both of them have advantages and disadvantages compared to each other. In this paper, we review the progress on the model work in recent years and introduce some new results and predictions based on these models. These results cannot only give explanations for current observations, but also give predictions for future HI and CO surveys using large radio facilities, e.g. ALMA, ASKAP, SKA, FAST, etc.